After the events of Mask of Deception, the Yamato Empire is now ruled with an iron fist by a ruthless usurper who seeks to subjugate all before him. It's up to a couple of familiar faces to band together against the might of the Imperial army, and the fate of the world hangs in the balance as nations and generals must pick a side to fight with in this perilous civil war. Secrets will be revealed, friendships will be tested, and battles will be fought. Will peace and order be restored or will victory at any cost be the beginning of the end?

Set in Tokyo, it's January 29, 2030. High-frequency resonance is observed in the vicinity of Tokyo, and the red fog rolls into the city. Those who hear the sound, humans and animals alike, pass out, losing consciousness. Everything shuts down in Tokyo, believing that the fog is carrying an unknown virus that causes an epidemic. However, six days later, after the incident, people wake up as if nothing happened. After that, Tokyo's sealed-off city sections gradually return to normal. However, since the high-frequency resonance, some "bizarre events" start to happen, and people find themselves being pulled deeper into more mysteries. Meanwhile, young people start to become aware of themselves and release their power hidden in their blood, discovering themselves as "vessel of wisdom blood." Together, being led by something unknown, they meet, communicate, and face the unavoidable circle of fate, sacrificing their own lives. (Source: MAL News)

Yukino Miyazawa is the female representative for her class and the most popular girl among the freshmen at her high school. Good at both academics and sports on top of being elegant and sociable, she has been an object of admiration all her life. However, in reality, she is an incredibly vain person who toils relentlessly to maintain her good grades, athleticism, and graceful appearance. She wants nothing more than to be the center of attention and praise—which is why she cannot stand Soichiro Arima, the male representative for her class and the only person more perfect than her. Since the first day of high school, she has struggled to steal the spotlight from her new rival but to no avail. At last, on the midterm exams, Yukino gets the top score and beats Soichiro. But, to her surprise, he congratulates her on her achievement, leading her to question her deceptive lifestyle. When Soichiro confesses his love to Yukino, she turns him down and gloats about it at home with only a hint of regret. But the very next day, Soichiro visits Yukino house to bring her a CD and sees her uninhibited self in action; now equipped with the truth, he blackmails her into completing his student council duties. Coerced into spending time with Soichiro, Yukino learns that she is not the only one hiding secrets. [Written by MAL Rewrite]

Yoichi Karasuma has spent all of his life in the mountains, training in the Soaring Wind, Divine Wind swordsmanship style. Under his father’s guidance, he is able to master the technique at the age of 17. With nothing left to learn, Yoichi is sent to a new dojo located in the city so he can continue to train and gain an understanding of modern society. Unfortunately, Yoichi has no idea how to act or speak to anyone in the present day and acts like a samurai, complete with odd speech and traditional clothing. As he goes to live with the Ikaruga sisters at the dojo, Yoichi, clueless on how to interact with others, is constantly hurtled in hilarious misunderstandings. Asu no Yoichi! follows Yoichi as he stumbles through his new life and tries to learn how to live in the modern world with his new family.